I found it interesting because it gives a comprehensive listing of the various manufacturers and their models in each category. After you select a category, e.g. dust collectors, you can also filter by the criteria listed down the left side of the page.

There doesn’t seem to be much content other than the manufacturers’ descriptions, but you are able to compare machines you select. I do not know how they establish their ratings. It seems to be a new site since they only have 19 registered users. Anyhow, it might be a helpful starting point if you are in the market for a new tool.